When some one says something completely retarded and out of context with the conversation. Also can be used if an action is really dumb or pointless. You reply with the phrase ok hunter....
Hunter is also the term for retard and can be interchanged in almost any sentence

Dude i love it when unicorns are..... OK HUNTER

random sex noises in french.... OK HUNTER

AHAHAHHAHAHAAHAHA(laughing hysterically and out of control)..... OK HUNTER